Sulking after vets

Our feral rescue we have had a year has come a long way, but I’m worried we had a big step backwards. When we got her she was terrified of people and being touched. Well she has come leaps and bounds this year. Likes to be patted sleeps by our feet. Moved from slinking around the side of the room and staying on the cat trees to laying on our bed and allowing us to help her to sunny spots. Her yearly check up came up and she had two shots and they clipped her claws. Poor girl has been sulking all day and isn’t in her usual spot for bedtime. How long do your kitties that sulk after the vets take to go back to routine?